51 lines
1.8 KiB
TypeScript
51 lines
1.8 KiB
TypeScript
import { createSlice, PayloadAction } from '@reduxjs/toolkit';
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import { AppThunk, RootState } from '../../app/store';
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interface CounterState {
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value: number;
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}
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const initialState: CounterState = {
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value: 0,
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};
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export const counterSlice = createSlice({
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name: 'counter',
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initialState,
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reducers: {
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increment: state => {
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// Redux Toolkit allows us to write "mutating" logic in reducers. It
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// doesn't actually mutate the state because it uses the Immer library,
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// which detects changes to a "draft state" and produces a brand new
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// immutable state based off those changes
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state.value += 1;
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},
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decrement: state => {
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state.value -= 1;
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},
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// Use the PayloadAction type to declare the contents of `action.payload`
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incrementByAmount: (state, action: PayloadAction<number>) => {
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state.value += action.payload;
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},
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},
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});
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export const { increment, decrement, incrementByAmount } = counterSlice.actions;
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// The function below is called a thunk and allows us to perform async logic. It
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// can be dispatched like a regular action: `dispatch(incrementAsync(10))`. This
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// will call the thunk with the `dispatch` function as the first argument. Async
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// code can then be executed and other actions can be dispatched
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export const incrementAsync = (amount: number): AppThunk => dispatch => {
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setTimeout(() => {
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dispatch(incrementByAmount(amount));
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}, 1000);
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};
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// The function below is called a selector and allows us to select a value from
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// the state. Selectors can also be defined inline where they're used instead of
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// in the slice file. For example: `useSelector((state: RootState) => state.counter.value)`
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export const selectCount = (state: RootState) => state.counter.value;
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export default counterSlice.reducer;
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